Burglar alarm



FIG. 1 is a perspective view of a burglar alarm showing my new design,the chain being shown in broken lines for illustrative purposes only;

FIG. 2 is a side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof; and

FIG. 5 is a view of the side opposite that shown in FIG. 2.

The ornamental design for a burglar alarm, as shown and described.